管线钢焊缝中晶内针状铁素体的研究进展  

Research Progress of Intragranular Acicular Ferrite in Pipeline Steel Weld

作　　者：李东[1] 尹立孟[1] 王学军[2] 蒋勇[3] 耿燕飞[1] 姚宗湘[1] 

机构地区：[1]重庆科技学院冶金与材料工程学院,重庆401331 [2]四川石油天然气建设工程有限责任公司,成都610041 [3]四川大西洋焊接材料股份有限公司,四川自贡643000

出　　处：《焊管》2016年第2期10-13,18,共5页Welded Pipe and Tube

基　　金：重庆市前沿与应用基础研究项目(cstc2014 jcyj A40009;cstc2015jcyj A50017);重庆市研究生科研创新项目(CYS15227)

摘　　要：为了研究晶内针状铁素体(intragranular acicular ferrite,IAF)对低碳微合金高强度管线钢焊接质量的影响,从IAF的本质、形核机理和长大以及影响其形核的因素等几方面进行了详细分析。研究认为,IAF是一种以非金属夹杂物诱发形核长大的组织,夹杂物种类、夹杂物尺寸、原奥氏体晶粒尺寸和冷却速度是影响其形核的主要因素,低碳微合金高强度管线钢焊缝中的IAF具有显著提高管线钢强度和改善韧性的作用。研究结果以期为高性能管线钢焊接的深入研究及生产实践提供科学指导与参考。In order to study the influence of intragranular acicular ferrite（IAF） on welding quality of low carbon microalloyed high strength pipeline steel, in this article, it detailedly analyzed from several aspects, such as IAF essence, nucleation mechanism and grow up, and effect factors on nucleation. The research results considered IAF is a kind of structure caused by non-metallic inclusion inducing nucleation, inclusions species, inclusions size, the original austenite grain size and cooling rate are the main factors affecting nucleation. IAF in low carbon microalloyed high strength pipeline steel weld can significantly improve the strength and toughness of pipeline steel. The study will provide scientific guidance and reference for further research and production practice of high performance pipeline steel welding.

关 键 词：管线钢 晶内形核针状铁素体(IAF) 形核长大 机理 

分 类 号：TG113.12[金属学及工艺—物理冶金]